# w write 写入 ---> 直接覆盖原内容
# with open('./files/test.txt','w',encoding='utf-8') as f:
#     f.write('我是写入的内容')
# with open('./files/test.txt','r',encoding='utf-8') as f:
#    print(f.read())

# 将原本内容的第二行修改为666

f = open('./files/test.txt','r',encoding = 'utf-8')
str1 = f.read()
str2 = str1.replace('222','666')
f.close()
print()

# fw = open('./files/test.txt','w',encoding = 'utf-8')
# fw.write(str2)
# # fluse 确认写入
# fw.fluse()

# fr = open('./files/test.txt','r',encoding = 'utf-8')
# print(fr.read())
# fr.close()
